To edit the Automatic Proxy Configuration settings in Mac OS, follow these steps: To resolve this problem, host the PAC file on a web server that can be accessed by using the HTTP protocol, and then specify the URL of the file in the Automatic Proxy Configuration setting of the Advanced Network preferences in Mac OS. Note A file-based PAC file is a file whose URL begins with file://. This issue occurs when a file-based PAC file is used in the Automatic Proxy Configuration setting in Mac OS.
In this scenario, Outlook 2016 for Mac crashes. You try to access a remote resource by using the HTTP protocol. You use Microsoft Outlook 2016 for Mac on a Mac computer that’s configured to use a Proxy Auto Configuration (PAC) file.